Driving lug for demountable rims of vehicle wheels



Nov 27, 1923.1

' l,475,1 67 w." N. BOOTH DRIVING LUG FOR DEMOUNTABLE RIMS OF VEHICLE WHEELS Filed Dec. 5, 1919 Patented Nov. 2?, i923.

stares rarest erries;

WILLIAM IN. BOQTH, GE DETROIT, MICHIGAN.

DRIVING LUG FOR DEMOUNTABLE RIMS OF VEHICLE WHEELS.

Application filed December 5, 1919. Serial No. 342,611.

To all whom it may concern:

Be it known that 1, WILLIAM N. BOOTH, a citizen of the United States of America, residing at Detroit, in the county of vVayne and State of'ltlichigan, have invented cer' tain new and useful Improvements in Drivportions for engagement with the cooperating lug. To safely stand the stress, these metal stampings must be of relatively heavy gauge and it has been found in practice that it is difficult to shear the metal without lateral distortion of the same. This is particularly objectionable in the forming of the rivet portions of the lug as it interferes with a proper fit in the aperture in the web. To overcome this defect l have devised a method of forming the lug which consists essentially in first blanking from sheet metal of thinner gauge and then folding the blank to obtain the required thickness. Thus the lighter gauge facilitates the shearing operation without distortion and by folding the blank so that the opposite sides of the lug are formed from portions originally on the same side of the blank practically all distortion is eliminated.

In the drawings:

Figure 1 is a plan View of the blank;

Figure 2 is a cross-section thereof after the preliminary folding operation;

Figure 3 is a similar view of the completed structure;

Figure 4: is a longitudinal section through a portion of the rim with the lug in engagement therewith.

The lug in its final form is preferably of a contour forming a bifurcated portion A with a recess B between the furcations thereof and with rivet portions C and C for engagement with apertures in the web. These rivet portions are rectangular in cross-section and are adapted to fit corre spondingly shaped punch apertures 1n the web of the run. It is therefore essential that these portions should be accurately formed in order that they may be easily assembled and securely fastened.

As above stated, it has been found that where the lug is sheared from thick stock, the metal will be deflected laterally and will thus destroy the accuracy of form. This defect I avoid by starting with stock onehalf the thickness of the finished lug and blanking therefrom complementary portions 1) and D on opposite sides of a center line E-E. The blank is then folded upon the line EE, first with the open return-bend,

as indicated at F in Figure 2, after which the parallel side portions G and G are pressed together, as indicated in Figure 3.

Any deflection of the metal, due to the first shearing operation will be in the same direction in the double blank shown in Figure 1, but will be in opposite direction in the folded blank shown in Figure 2. Thus when the two side of the blank are pressed together, such deflection will be corrected with the result that the finished blank is accuratelv formed. The rivet portions C and C will then accurately fit apertures in the web H and will be firmly secured by rivetmg.

What I claim as my invention is:

1. A driving lug for demountable rims of vehicle wheels comprising rivet portions and a projecting driving portion, both formed of a folded blank.

2. A driving lug for demountable rims of vehicle wheels comprising a folded blank having complementary portions in registraedge and opposite sides of the recess, said body comprising a folded sheet metal blank punched with corresponding projections at the ends of theblank and with an aperture located centrally of the blank, said projections forming the rivet portions and said aperture torming the recess.

oi'iving lug for deinountuble rims of vehicle wheels con'iprising a body having a bifurcated driving portion in one edge and rivet portions on the opposite edge, said body comprising. a folded punched blank of sheet metal.

In testimony whereof I afii): my signature.

WILLIAM N. BOOTH. 

